A sulfosalicylic acid silver plating additive, its preparation method and electroplating solution containing it

Abstract

The invention discloses a sulfosalicylic acid silver plated additive, a preparation method of the sulfosalicylic acid silver plated additive and electroplating liquid including the sulfosalicylic acidsilver plated additive. The sulfosalicylic acid silver plated additive comprises 10 g / L-15 g / L of polyethylene glycol, 30 g / L-50 g / L of paranitroaniline, 8 g / L-10 g / L of azodiisobutyronitrile, 8 g / L-12 g / L of propylbenzene, 200 g / L-400 g / L of EDTA, 100 g / L-200 g / L of sodium dimercaptosulphonate and the balance water. By means of the silver plated additive, the dispersibility, stability, electroplating performance and the like of the electroplating liquid are improved quite remarkably, the pH value does not need to be repeatedly adjusted in the electroplating process, meanwhile, the smoothness, adhesive force, glossiness color change resistance and other performance of a silver plated layer are improved remarkably, the thickness of the plating layer is reduced, and the phenomena of fracturing and the like are avoided. The electroplating liquid includes no cyanide, the plating layer is bright in mirror surface, small in brittleness, good in adhesive force, level in surface, bright, goodin color change resistance and high in heat resistance, application to multiple fields such as decorative electroplating and functional electroplating can be met, the electroplating liquid can be directly sued for brass, copper, chemical nickel and other workpieces, pre-plating is not needed, and the binding force can be guaranteed.

Description

technical field [0001] The invention relates to a sulfosalicylic acid silver-plating additive, a preparation method thereof and an electroplating solution containing the same, belonging to the field of silver-plating. Background technique [0002] Silver has a unique silver-white luster, excellent electrical conductivity and brazing properties, relatively stable chemical properties to organic acids and alkalis, and is cheaper than other precious metals. Silver plating is widely used in tableware, jewelry, and artworks. , electrical contact materials in the electrical and electronic industries, etc. [0003] So far, most of the silver electroplating processes at home and abroad still use cyanide-based silver-plating, because the cyanide-based silver-plating process has good stability of the plating solution, good uniform plating ability and depth ability, and fine crystallization of the coating. However, cyanide is a highly toxic substance, which is harmful to the health of ...

AI Technical Summary

Problems solved by technology

However, cyanide is a highly toxic substance, which is harmful to the health of on-site operators. Good ventilation equipment is required during production, and the discharged sewage is not conducive to environmental protection.

[0004] With the development of industry, environmental pollution has become more and more serious, the awareness of environmental protection in various countries in the world has also been continuously strengthened, and the introduction of related policies has gradually eliminated cyanide-based silver plating. However, the existing cyanide-free silver plating has dull luster and Defects such as uneven layer, poor discoloration resistance, thick coating, poor adhesion, and easy cracking

Images